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<?php declare(strict_types=1); | |
if (!\function_exists('array_map_recursive')) { | |
function array_map_recursive(array $array, callable $function): array | |
{ | |
$out = []; | |
foreach ($array as $key => $value) { | |
$out[$key] = \is_array($value) | |
? array_map_recursive($value, $function) | |
: \call_user_func($function, $value, $key); | |
} | |
return $out; | |
} | |
} |
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<?php declare(strict_types=1); | |
/** | |
* @see http://raganwald.com/2018/08/30/to-grok-a-mockingbird.html | |
*/ | |
function memoize(\Closure $function): \Closure | |
{ | |
static $lookup = []; | |
return function (...$args) use ($function, &$lookup) { | |
$key = \sha1(\json_encode(\array_map_recursive($args, function ($value) { | |
return \is_object($value) ? \spl_object_hash($value) : $value; | |
}))); | |
return $lookup[$key] ?? ($lookup[$key] = $function(...$args)); | |
}; | |
} | |
function mockingbird(\Closure $function): callable | |
{ | |
return function (...$args) use ($function) { | |
return $function($function, ...$args); | |
}; | |
} | |
$exponent = function (\Closure $self, int $x, int $n): int { | |
if ($n === 0) { | |
return 1; | |
} elseif ($n % 2 === 1) { | |
return $x * $self($self, $x * $x, (int) \floor($n / 2)); | |
} else { | |
return $self($self, $x * $x, $n / 2); | |
} | |
}; | |
$exp = mockingbird(memoize($exponent)); | |
echo $exp(2, 8) . \PHP_EOL; | |
echo $exp(2, 8) . \PHP_EOL; | |
echo $exp(2, 9) . \PHP_EOL; | |
echo \PHP_EOL; |
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<?php declare(strict_types=1); | |
if (!\function_exists('unflatten')) { | |
/** | |
* Takes a flat array (such as from an SQL result set) and unflattens it according to dot-notation, such as: | |
* ['username' => 'admin', 'metadata.created' => '2018-04-24', 'metadata.updated' => '2018-09-17'] | |
* | |
* [ | |
* 'username' => 'admin', | |
* 'metadata' => [ | |
* 'created' => '2018-04-24', | |
* 'updated' => '2018-09-17', | |
* ], | |
* ] | |
*/ | |
function unflatten(array $array): array | |
{ | |
$out = []; | |
foreach ($array as $dotNotation => $value) { | |
if (!\is_string($dotNotation)) { | |
$out[$dotNotation] = $value; | |
continue; | |
} | |
$keys = explode('.', $dotNotation); | |
while ($key = \array_pop($keys)) { | |
$value = [$key => $value]; | |
} | |
$out = \array_merge_recursive($out, $value); | |
} | |
return $out; | |
} | |
} |
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